include/hw/virtio/virtio-rng.h

   1 /*
   2  * Virtio RNG Support
   3  *
   4  * Copyright Red Hat, Inc. 2012
   5  * Copyright Amit Shah <amit.shah@redhat.com>
   6  *
   7  * This work is licensed under the terms of the GNU GPL, version 2 or
   8  * (at your option) any later version.  See the COPYING file in the
   9  * top-level directory.
  10  */
  11
  12 #ifndef _QEMU_VIRTIO_RNG_H
  13 #define _QEMU_VIRTIO_RNG_H
  14
  15 #include "sysemu/rng.h"
  16 #include "sysemu/rng-random.h"
  17 #include "standard-headers/linux/virtio_rng.h"
  18
  19 #define TYPE_VIRTIO_RNG "virtio-rng-device"
  20 #define VIRTIO_RNG(obj) \
  21         OBJECT_CHECK(VirtIORNG, (obj), TYPE_VIRTIO_RNG)
  22 #define VIRTIO_RNG_GET_PARENT_CLASS(obj) \
  23         OBJECT_GET_PARENT_CLASS(obj, TYPE_VIRTIO_RNG)
  24
  25 struct VirtIORNGConf {
  26     RngBackend *rng;
  27     uint64_t max_bytes;
  28     uint32_t period_ms;
  29     RndRandom *default_backend;
  30 };
  31
  32 typedef struct VirtIORNG {
  33     VirtIODevice parent_obj;
  34
  35     /* Only one vq - guest puts buffer(s) on it when it needs entropy */
  36     VirtQueue *vq;
  37
  38     VirtIORNGConf conf;
  39
  40     RngBackend *rng;
  41
  42     /* We purposefully don't migrate this state.  The quota will reset on the
  43      * destination as a result.  Rate limiting is host state, not guest state.
  44      */
  45     QEMUTimer *rate_limit_timer;
  46     int64_t quota_remaining;
  47     bool activate_timer;
  48 } VirtIORNG;
  49
  50 #endif